HD 28700

HD 28700
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Caelum
Right ascension 04h 29m 20.0860s[1]
Declination −46° 30′ 54.9738″[1]
Apparent magnitude (V) 6.12±0.01[2]
Characteristics
Evolutionary stage red giant branch[1]
Spectral type K1 III[3]
B−V color index +1.06[4]
Astrometry
Radial velocity (Rv)10.7±0.4[5] km/s
Proper motion (μ) RA: +51.283 mas/yr[1]
Dec.: +36.503 mas/yr[1]
Parallax (π)8.4964 ± 0.0265 mas[1]
Distance384 ± 1 ly
(117.7 ± 0.4 pc)
Absolute magnitude (MV)+0.69[6]
Details
Mass3.0[1] M☉
Radius10.5[1] R☉
Luminosity56±2[7] L☉
Surface gravity (log g)2.61[1] cgs
Temperature4,760±90[7] K
Metallicity [Fe/H]+0.08[8] dex
Rotational velocity (v sin i)<1[9] km/s
Age377[1] Myr
Other designations
5 G. Caeli, CD−46°1427, CPD−46°433, GC 5485, HD 28700, HIP 20934, HR 1433, SAO 216832[10][11]
Database references
SIMBADdata

HD 28700 (HR 1433) is a solitary star in the southern constellation Caelum. It has an apparent magnitude of 6.12,[2] making it visible to the naked eye under ideal conditions. Parallax measurements place the object at a distance of 384 light years[1] and is currently receding with a heliocentric radial velocity of 10.7 km/s.[5]

HD 28700 has a stellar classification of K1 III,[3] indicating that it is a red giant. It has three times the Sun's mass and has expanded to ten times its radius. It radiates at 56 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,760 K,[7] giving it an orange hue. HD 28700 has a projected rotational velocity too low to be measured accurately due to it being less than 1 km/s.[9] HD 28700 has 120% the abundance of iron relative to the Sun.[8] At a modeled age of 377 million years, HD 28700 is on the red giant branch fusing hydrogen in a shell around an inert helium core.[1]

  1. ^ a b c d e f g h i j k Cite error: The named reference DR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Charbonnel2020 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Eggen1994 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference DeMederios2014 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).